linux-kernel - [PATCHv2] sched/uclamp: Fix unnused variable warning

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Message-ID: <a1e9c342-01c9-44f0-a789-2c908e57942b@arm.com>
Date: Fri, 25 Oct 2024 11:53:17 +0100
From: Christian Loehle <christian.loehle@....com>
To: Peter Zijlstra <peterz@...radead.org>,
 Sebastian Siewior <bigeasy@...utronix.de>
Cc: Thomas Gleixner <tglx@...utronix.de>, Juri Lelli <juri.lelli@...hat.com>,
 Ingo Molnar <mingo@...hat.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Vincent Guittot <vincent.guittot@...aro.org>, oe-kbuild-all@...ts.linux.dev,
 kernel test robot <lkp@...el.com>, Valentin Schneider <vschneid@...hat.com>,
 Dietmar Eggemann <dietmar.eggemann@....com>, xiqi2@...wei.com
Subject: [PATCHv2] sched/uclamp: Fix unnused variable warning

uclamp_mutex is only used for CONFIG_SYSCTL or
CONFIG_UCLAMP_TASK_GROUP so declare it __maybe_unused.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202410060258.bPl2ZoUo-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202410250459.EJe6PJI5-lkp@intel.com/
Signed-off-by: Christian Loehle <christian.loehle@....com>
---
v2: __maybe_unused instead of ifdef (Peter)

 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 114adac5a9c8..9bad282e7950 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1399,7 +1399,7 @@ void set_load_weight(struct task_struct *p, bool update_load)
  * requests are serialized using a mutex to reduce the risk of conflicting
  * updates or API abuses.
  */
-static DEFINE_MUTEX(uclamp_mutex);
+static __maybe_unused DEFINE_MUTEX(uclamp_mutex);

 /* Max allowed minimum utilization */
 static unsigned int __maybe_unused sysctl_sched_uclamp_util_min = SCHED_CAPACITY_SCALE;
--
2.34.1